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Fair Value Measurements And Disclosure (Long-Term Debt And Other Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and debentures $ 155,218 $ 161,109
Commercial paper 1,754 0
Bank borrowings 0 4
Investment securities 3,669 3,723
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes and debentures 181,872 182,124
Commercial paper 1,754 0
Bank borrowings 0 4
Investment securities $ 3,669 $ 3,723